<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @copyright   Copyright (c) 2014 X.commerce, Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
namespace Magento\CatalogInventory\Model\Plugin;

class Layer
{
    /**
     * Stock status instance
     *
     * @var \Magento\CatalogInventory\Model\Stock\Status
     */
    protected $_stockStatus;

    /**
     * Store config instance
     *
     * @var \Magento\Framework\App\Config\ScopeConfigInterface
     */
    protected $_scopeConfig;

    /**
     * @param \Magento\CatalogInventory\Model\Stock\Status $stockStatus
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
     */
    public function __construct(
        \Magento\CatalogInventory\Model\Stock\Status $stockStatus,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
    ) {
        $this->_stockStatus = $stockStatus;
        $this->_scopeConfig = $scopeConfig;
    }

    /**
     * Before prepare product collection handler
     *
     * @param \Magento\Catalog\Model\Layer $subject
     * @param \Magento\Catalog\Model\Resource\Collection\AbstractCollection $collection
     *
     * @return void
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     */
    public function beforePrepareProductCollection(
        \Magento\Catalog\Model\Layer $subject,
        \Magento\Catalog\Model\Resource\Collection\AbstractCollection $collection
    ) {
        if ($this->_isEnabledShowOutOfStock()) {
            return;
        }
        $this->_stockStatus->addIsInStockFilterToCollection($collection);
    }

    /**
     * Get config value for 'display out of stock' option
     *
     * @return bool
     */
    protected function _isEnabledShowOutOfStock()
    {
        return $this->_scopeConfig->isSetFlag('cataloginventory/options/show_out_of_stock', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);
    }
}
